Type.FindInterfaces(TypeFilter, Object) Type.FindInterfaces(TypeFilter, Object) Type.FindInterfaces(TypeFilter, Object) Type.FindInterfaces(TypeFilter, Object) Method

定义

返回表示接口(由当前 Type 所实现或继承)的筛选列表的 Type 对象数组。Returns an array of Type objects representing a filtered list of interfaces implemented or inherited by the current Type.

public:
 virtual cli::array <Type ^> ^ FindInterfaces(System::Reflection::TypeFilter ^ filter, System::Object ^ filterCriteria);
public virtual Type[] FindInterfaces (System.Reflection.TypeFilter filter, object filterCriteria);
abstract member FindInterfaces : System.Reflection.TypeFilter * obj -> Type[]
override this.FindInterfaces : System.Reflection.TypeFilter * obj -> Type[]
Public Overridable Function FindInterfaces (filter As TypeFilter, filterCriteria As Object) As Type()

参数

filter
TypeFilter TypeFilter TypeFilter TypeFilter

对照 filterCriteria 比较接口的委托。The delegate that compares the interfaces against filterCriteria.

filterCriteria
Object Object Object Object

确定接口是否应包括在返回数组中的搜索判据。The search criteria that determines whether an interface should be included in the returned array.

返回

Type[]

一个 Type 对象的数组,它表示由当前 Type 实现或继承的接口的已筛选的列表;如果当前 Type 未实现或继承与筛选器相匹配的接口,则为空数组。An array of Type objects representing a filtered list of the interfaces implemented or inherited by the current Type, or an empty array if no interfaces matching the filter are implemented or inherited by the current Type.

实现

异常

调用静态初始值设定项时引发了异常。A static initializer is invoked and throws an exception.

示例

下面的示例查找指定类型实现或继承的指定接口,然后显示接口名称。The following example finds the specified interface implemented or inherited by the specified type, and then displays the interface names.

#using <system.xml.dll>

using namespace System;
using namespace System::Xml;
using namespace System::Reflection;
public ref class MyFindInterfacesSample
{
public:
    static bool MyInterfaceFilter(Type^ typeObj, Object^ criteriaObj)
    {
        if(typeObj->ToString()->Equals(criteriaObj->ToString()))
            return true;
        else
            return false;
   }
};

int main()
{
    try
    {
        XmlDocument^ myXMLDoc = gcnew XmlDocument;
        myXMLDoc->LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" 
            + "<title>Pride And Prejudice</title> </book>");
        Type^ myType = myXMLDoc->GetType();
      
        // Specify the TypeFilter delegate that compares the interfaces 
        // against filter criteria.
        TypeFilter^ myFilter = gcnew TypeFilter( 
            MyFindInterfacesSample::MyInterfaceFilter);
        array<String^>^myInterfaceList = {"System.Collections.IEnumerable",
            "System.Collections.ICollection"};
        for(int index = 0; index < myInterfaceList->Length; index++)
        {
            array<Type^>^myInterfaces = myType->FindInterfaces( 
                myFilter, myInterfaceList[index]);
            if(myInterfaces->Length > 0)
            {
                Console::WriteLine("\n{0} implements the interface {1}.", 
                    myType, myInterfaceList[index]);
                for(int j = 0; j < myInterfaces->Length; j++)
                Console::WriteLine("Interfaces supported: {0}.",
                    myInterfaces[j]);
            }
            else
                Console::WriteLine(
                    "\n{0} does not implement the interface {1}.", 
                    myType, myInterfaceList[index]);

        }
    }
    catch(ArgumentNullException^ e) 
    {
        Console::WriteLine("ArgumentNullException: {0}", e->Message);
    }
    catch(TargetInvocationException^ e) 
    {
        Console::WriteLine("TargetInvocationException: {0}", e->Message);
    }
    catch(Exception^ e) 
    {
        Console::WriteLine("Exception: {0}", e->Message);
    }
}

using System;
using System.Xml;
using System.Reflection;

public class MyFindInterfacesSample 
{
    public static void Main()
    {
        try
        {
            XmlDocument myXMLDoc = new XmlDocument();
            myXMLDoc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" +
                "<title>Pride And Prejudice</title>" + "</book>");
            Type myType = myXMLDoc.GetType();

            // Specify the TypeFilter delegate that compares the 
            // interfaces against filter criteria.
            TypeFilter myFilter = new TypeFilter(MyInterfaceFilter);
            String[] myInterfaceList = new String[2] 
                {"System.Collections.IEnumerable", 
                "System.Collections.ICollection"};
            for(int index=0; index < myInterfaceList.Length; index++)
            {
                Type[] myInterfaces = myType.FindInterfaces(myFilter, 
                    myInterfaceList[index]);
                if (myInterfaces.Length > 0) 
                {
                    Console.WriteLine("\n{0} implements the interface {1}.",
                        myType, myInterfaceList[index]);	
                    for(int j =0;j < myInterfaces.Length;j++)
                        Console.WriteLine("Interfaces supported: {0}.", 
                            myInterfaces[j].ToString());
                }
                else
                    Console.WriteLine(
                        "\n{0} does not implement the interface {1}.", 
                        myType,myInterfaceList[index]);	
            }
        }
        catch(ArgumentNullException e)
        {
            Console.WriteLine("ArgumentNullException: " + e.Message);
        }
        catch(TargetInvocationException e)
        {
            Console.WriteLine("TargetInvocationException: " + e.Message);
        }
        catch(Exception e)
        {
            Console.WriteLine("Exception: " + e.Message);
        }
    }
      
    public static bool MyInterfaceFilter(Type typeObj,Object criteriaObj)
    {
        if(typeObj.ToString() == criteriaObj.ToString())
            return true;
        else
            return false;
    }
}

Imports System.Xml
Imports System.Reflection

Public Class MyFindInterfacesSample
    Public Shared Sub Main()
        Try
            Dim myXMLDoc As New XmlDocument()
            myXMLDoc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" _
                & "<title>Pride And Prejudice</title>" & "</book>")
            Dim myType As Type = myXMLDoc.GetType()

            ' Specify the TypeFilter delegate that compares the 
            ' interfaces against filter criteria.
            Dim myFilter As New TypeFilter(AddressOf MyInterfaceFilter)
            Dim myInterfaceList() As String = _
                {"System.Collections.IEnumerable", _
                "System.Collections.ICollection"}
            Dim index As Integer
            For index = 0 To myInterfaceList.Length - 1
                Dim myInterfaces As Type() = _
                    myType.FindInterfaces(myFilter, myInterfaceList(index))
                If myInterfaces.Length > 0 Then
                    Console.WriteLine(ControlChars.Cr & _
                        "{0} implements the interface {1}.", _
                        myType, myInterfaceList(index))
                    Dim j As Integer
                    For j = 0 To myInterfaces.Length - 1
                        Console.WriteLine("Interfaces supported: {0}", _
                            myInterfaces(j).ToString())
                    Next j
                Else
                    Console.WriteLine(ControlChars.Cr & _
                        "{0} does not implement the interface {1}.", _
                        myType, myInterfaceList(index))
                End If
            Next index
        Catch e As ArgumentNullException
            Console.WriteLine("ArgumentNullException: " & e.Message)
        Catch e As TargetInvocationException
            Console.WriteLine("TargetInvocationException: " & e.Message)
        Catch e As Exception
            Console.WriteLine("Exception: " & e.Message)
        End Try
    End Sub
    Public Shared Function MyInterfaceFilter(ByVal typeObj As Type, _
        ByVal criteriaObj As [Object]) As Boolean
        If typeObj.ToString() = criteriaObj.ToString() Then
            Return True
        Else
            Return False
        End If
    End Function 'MyInterfaceFilter 
End Class 'MyFindInterfacesSample

注解

此方法可由派生类重写。This method can be overridden by a derived class.

类提供Module.FilterTypeNameIgnoreCase的和委托System.Reflection.TypeFilter还可以用来Module.FilterTypeName代替委托 System.Reflection.ModuleThe Module.FilterTypeName and Module.FilterTypeNameIgnoreCase delegates supplied by the System.Reflection.Module class may also be used, in lieu of the System.Reflection.TypeFilter delegate.

此类实现的所有接口都是在搜索过程中考虑的,无论是由基类还是此类本身来声明。All of the interfaces implemented by this class are considered during the search, whether declared by a base class or this class itself.

此方法搜索基类层次结构,并返回每个类实现的每个匹配接口以及这些接口中每个接口实现的所有匹配接口(即,返回匹配接口的传递闭包)。This method searches the base class hierarchy, returning each of the matching interfaces each class implements as well as all the matching interfaces each of those interfaces implements (that is, the transitive closure of the matching interfaces is returned). 不返回重复的接口。No duplicate interfaces are returned.

如果当前Type表示泛型类型或泛型方法的定义中的类型参数, FindInterfaces则会搜索在类型参数上的约束中声明的所有接口,以及通过接口继承的所有接口。在约束中声明。If the current Type represents a type parameter in the definition of a generic type or generic method, FindInterfaces searches all the interfaces declared in the constraints on the type parameter, and all interfaces inherited through the interfaces declared in the constraints. 如果当前Type表示泛型类型的类型参数, FindInterfaces则搜索该类型实现的所有接口,无论它们是否与约束匹配。If the current Type represents a type argument of a generic type, FindInterfaces searches all the interfaces implemented by the type, whether or not they match constraints.

备注

FindInterfaces即使在非泛型类型上,也可以返回泛型接口。FindInterfaces can return generic interfaces, even on types that are not generic. 例如,非泛型类型可能实现IEnumerable<int>IEnumerable(Of Integer) Visual Basic)。For example, a nongeneric type might implement IEnumerable<int> (IEnumerable(Of Integer) in Visual Basic).

适用于

另请参阅